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Math for Kids23 chapters | 325 lessons

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Lesson Transcript

Instructor:
*Shelly Merrell*

Shelly has a Master's of Education. Most recent professional experience is an educational diagnostician. Prior, she taught for 8 years.

In today's lesson, we'll talk about circles. Read on to learn what a circle is, what a circle looks like, and why circles are important. Then, test your knowledge with a fun activity and a short quiz.

Do you remember the song 'If You're Happy and You Know It?' Start singing that song! Are you clapping, stomping and jumping? Now let's use the tune and change the words for 'The Circle Song:'

*A circle is a shape that is round.*

*A circle is a shape that is round.*

*A circle is a shape that is round,*

*And round and round.*

*A circle is a shape that is round.*

Now that you have circles on your mind, let's learn more about this interesting shape. A **circle** is a shape that is made up of a curved line. It's round, and all points on the curved line are an equal distance from the center point. This shape is two-dimensional, which means it's flat.

Circles are very important parts of geometry, the study of points, lines and shapes; but they're important outside of geometry as well. In fact, you can find circles in everyday life--they're just about everywhere. Do you have a cup on your desk? The shape of the rim is probably a circle. Is there a round button on your shirt? That's probably a circle, too! And so is the letter 'o' you find in so many words.

You may have noticed that the circles listed are all man-made, but circles are also very common in nature. The rings around Saturn, the pupils of your eyes and the center of a flower are all circles that are made by Mother Nature.

One interesting thing about circles is that there are no **perfect circles**. A perfect circle is one where the curved line is exactly, *precisely* the same distance from the center point. Look at the button on your shirt. It may seem to be perfectly circular, but if you look very closely, you'll notice some small imperfections. The same goes for all other circles you encounter, even if you need to look under a microscope to notice those imperfections.

As we talked about, circles can be found everywhere. There are probably countless circles waiting to be found all around your own home. Let's have a scavenger hunt to find some!

- Start outside. Try to find something shaped like a circle from just outside your door. It might be a ball laying in the yard or a tire on a car--from the sides, these look like circles.
- Now, look in your kitchen. There are many, many circles in the kitchen, like the rims of cups and bowls and the shape of plates. Some of your favorite cereals are circle-shaped, like Cheerios, and so are some crackers, pizzas and many fruits.
- Walk through the rest of your home and look for more circles. Door knobs and the clock on the wall are circles. See some change laying around? Quarters, dimes and pennies are circular. Keep looking and you might find much more.
- Lastly, look at your own body. Can you find any circles? Your eyes may be circles, as are the pupils on your eyes. The nostrils of your nose may even be circles.

A **circle** is a two-dimensional shape that is made up of a curved line. It's round, and all points on the curved line are an equal distance from the center point. Circles can be found everywhere, but remember that **perfect circles** don't actually exist.

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Math for Kids23 chapters | 325 lessons

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